# San Mateo County, CA property data

> San Mateo County, CA parcel data: 225,026 parcels with tax assessor records, zoning, historic designations, building codes, via API, MCP server and vector tiles.

Source: https://www.parceled.ai/coverage/california/san-mateo-county  
Publisher: Parceled (https://www.parceled.ai)  
Updated: 2026-10-30

Parceled covers 225,026 parcels in San Mateo County, CA, with tax assessor records, zoning, historic designations, building codes and hail history available through one API and MCP server. Tax assessor attributes are present for 99% of parcels (owner names on 100% of those records, year built on 0%).

- **Parcels:** 225,026
- **County FIPS:** 06081
- **Snapshot:** October 30, 2026

## What property data is available for San Mateo County?

| Dataset | San Mateo County |
| --- | --- |
| Parcel boundaries | 225,026 parcels |
| Tax assessor records | 222,686 records (99% of parcels) |
| Owner name and mailing address | 100% of assessor records |
| Market or assessed value | 0% of assessor records |
| Year built | 0% of assessor records |
| Last sale date | 0% of assessor records |
| Building permits | Not yet |
| Roofing permits | Not yet |
| Zoning | 22 zoning jurisdictions |
| Buildable-area screens | Yes |
| Historic designations | 64 |
| Adopted building codes | 1 jurisdiction |
| Hail history (radar) | Yes, every county in the contiguous US |

## How do I query San Mateo County property data?

Bulk-search every parcel in the county with `search_properties` using `state: "CA"` and `county: "081"` (the county FIPS code 06081), or look up one address with `search_parcels`. Check any single property for free with `check_availability`.

```json
{
  "name": "count_properties",
  "arguments": { "state": "CA", "county": "081" }
}
```

## Frequently asked questions

### How do I find who owns a property in San Mateo County?

Search the address on the San Mateo County assessor's website, or query Parceled's `search_parcels` for owner name and mailing address. See [how to find a property owner by address](https://www.parceled.ai/guides/how-to-find-property-owner-by-address).